Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8066490 | Wind turbine rotor blade A rotor blade for a wind turbine is disclosed. The rotor blade includes a flange section configured to connect the rotor blade to a rotor hub; and an airfoil section extending outward from the flange section. The flange section is comprised of a carbon reinforced po... | 11/29/2011 |
| 7438531 | Fan and rotor structure thereof A fan and a rotor structure thereof. The rotor structure has a case, an upper linking structure, a lower structure, and a rotating shaft. The case has an opening at the axle center. The upper linking structure has a fixing portion and a threaded portion. The minimum... | 10/21/2008 |
| 7293963 | Removable tail rotor boot A boot provides for removable attachment to a tail rotor assembly to flexibly protect the interior of the tail rotor blade assemblies. The boot includes a first fastener strip mounted adjacent a first boot edge and a second fastener strip mounted adjacent a second b... | 11/13/2007 |
| 7267528 | Plastic steel bearing for blade rotor shaft of cooling fan A bearing structure for the blade of cooling fan, comprises a hollow cylindrical body and an outward extended seat whose diameter is larger than the body. The seat has a recess at the bottom. The body forms a long cavity and upward flange. This bearing is placed in ... | 09/11/2007 |
| 7192255 | Device for mounting blades on a propeller hub with preloading of the bearings This device for mounting a propeller blade in a hub, of the type in which a blade base is mounted in rotation in a hub housing by means of at least two bearings and where a preloading device permitting axially preloading the two bearings comprises a holding ring mou... | 03/20/2007 |
| 7037080 | Method of constructing a fan blade An improved fan blade is constructed from a series of wooden slats. Holes are drilled through the wooden slats and a dowel is placed through each of the holes. The dowel is preferably a wooden rod that is secured in the hole with wood glue. Alternatively, the dowels... | 05/02/2006 |
| 6908121 | Locking arrangement for a threaded connector A connector arrangement used for connecting and locking tubular members. The connector consists of two tubular members and a coupling member. The tubular members are threaded together to create a threaded connection. The locking arrangement is provided by a pathway ... | 06/21/2005 |
| 6758654 | Advertising ceiling fan An advertising ceiling fan includes a motor seat, a plurality of blade support brackets, and a plurality of support tubes. Each of the blade support brackets is secured with a sleeve having two through holes. Each of the support tubes has one end formed with two pos... | 07/06/2004 |
| 6220820 | Bearing preload A bearing arrangement, for example, for a variable pitch propeller, has a fluid operated actuator (42, 34, 40) for causing relative movement between bearing surfaces of races (12, 32) so as to preload bearings (30) held there between. Mechanical locking m... | 04/24/2001 |
| 6022191 | Fan blade mounting A fan blade mounting system for large air-moving fans includes a radially extending hub strut, a blade root member pivotally coupled to an end of the hub strut for receiving a blade skin, and a tube end located between the blade root member and the hub st... | 02/08/2000 |
| 6015264 | Preloaded retention assembly for aircraft propeller blade retention A propeller blade retention assembly for use with a propeller having a hub rotatable about a propeller axis, is disclosed. The assembly includes a blade receiver for mounting the blade to the hub and an internal surface of a hub arm for interfacing the re... | 01/18/2000 |
| 5660527 | Wind turbine rotor blade root end A structure and method for transferring load, particularly bending load, from a blade to a blade hub, such as for use in a wind turbine device, is provided. In one embodiment, the structure includes two or more spaced-apart annular rings, respectively con... | 08/26/1997 |
| 5611665 | Marine propeller and method A marine propeller includes a series of releasably affixed blades which allow pitch adjustment. The blades are each secured to different blade disks which are positioned in hub wells and held by positioning pins. The method describes how the blades, which... | 03/18/1997 |
| 5415527 | Propeller assembly A propeller comprises a hub (1) rotatable about a propeller axis and formed with a hub barrel (1) with a central hub axis that extends radially of the propeller axis, a blade (9) having a support assembly (3) at its inner end received within the hub barre... | 05/16/1995 |
| 5173023 | Wind turbine generator blade and retention system A propeller blade cuff having a root end and a first annular flange at the root end, and a wind turbine generator hub having a second annular flange to be attached to the first flange comprising a clamp ring having multiple sections, the sections having f... | 12/22/1992 |
| 5129786 | Variable pitch pan blade retention arrangement To ensure retentioin of the blade tongue 16 of a prop-fan blade 10 within a receiving slot 24 in the disc arm 20 of the fan hub 4 even under the high centrifugal forces exerted on the blade 10 while rotating at high rpm, at least one pair of retaining pin... | 07/14/1992 |
| 5015150 | Arrangement for mounting a pivotable propfan blade In an arrangement for mounting a shrouded pivotable propfan blade at a rotor, the propfan blade is held in a dovetail mounting of a blade carrier and, by using a first securing device is fixed with respect to axial movements of the propfan blade. The blad... | 05/14/1991 |
| 4930989 | Fixed-angle keying piece for blades of axial fans The present invention relates to fixed-angle keying pieces for blades of axial fans each having a U-shaped cross section, the internal surface of which perfectly fits the profile of the blade while the external surface of the same has a plane side face wh... | 06/05/1990 |
| 4877376 | Attachment of a rotor blade of fiber reinforced plastic to a metal rotor hub A fiber reinforced thermoplastic propeller is attached to a metallic rotor by an integral shank at the base of the propeller. By virtue of the manufacture of the shank and the propeller as an integral construction, improved transmission of centrifugal for... | 10/31/1989 |
| 4844697 | Impeller for an axial flow fan In an impeller for use in an axial flow fan and having blades (5) which are adjustable during operation of the fan, each blade (5) is, through a blade shaft (7) connected to a hub (1) designed as a compact unit. The blade shaft (7) and an axial thrust bearing ... | 07/04/1989 |
| 4573874 | Spring biased bayonet coupling for fan blades Axial flow fan blade roots (1) are rotatably journalled to blade shafts (4) by bayonet plug and socket couplings. The socket recesses (30, 31) provide an axial play for the plug cam portions (28, 29). Screws (34, 35) extending through the blade root (1) h... | 03/04/1986 |
| 4012171 | Blade and mounting means There is disclosed a blade and mounting means particularly useful in the construction of axial flow compressors where blades of airfoil configuration are mounted in blade carriers so as to be removable and replaceable by manipulation of nuts on adapters a... | 03/15/1977 |
